When a system gives outputs that you do not predict，you regard those as unexpected events and try to identify the causes affecting those events． In this study,we try to understand how people identify the causes affecting unexpected events by using a card magic called the three card monte as an experimental material.In our experiments,the participants were required to find out the tricks　by watching a video in which a magician plays the magic.We focused on two cluesrelated tocause identification.The first is distinctiveness of events; and the second is availability of feedback information.The results of the experimentsshowed that the distinctiveness of events affected the performance of cause identification,whereas the availability of feedback information did not. The processanalyses revealed that even if feedback information was not directly given,the participants could perform reasoning for cause identification based on hypothetical information not observed.